[GitHub] spark pull request #22332: [SPARK-25333][SQL] Ability add new columns in Dat...

[jaceklaskowski <gi...@git.apache.org>]

Github user jaceklaskowski commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22332#discussion_r215144932
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
    @@ -2226,16 +2226,18 @@ class Dataset[T] private[sql](
         * `column`'s expression must only refer to attributes supplied by this Dataset. It is an
         * error to add a column that refers to some other Dataset.
         *
    -    * You can choose to add new columns either at the end (default behavior) or at the beginning.
    +    * The position of the new column start from 0, and a negative position means at the end (default behavior).
    --- End diff --
    
    "starts at `0`. Any negative position means to add the column at the end"?


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